At work, I inherited a machine which had DW MX2004, then
upgraded to DW 8, which is what it currently has on it. However, it
also still has DW MX2004 on it, which I don't use. I recently tried
to put on a free 3rd-party extension, but the Extension mgr will
not let me put the extension on, because it says it's only for DW 8
and higher.

When the Extension mgr is up, there is a dropdown where you
can choose your product. It only has one product listed: DW MX2004.
It is not recognizing DW 8 at all. I'm not sure what to do at this
point.